package handlers

import (
	"net/http"
	"strconv"
	"time"

	windowtypes "github.com/oy/openyield/x/window/types"
)

// registerWindow wires the Window authorization routes (REQ-042) into the mux.
func (s *Server) registerWindow(mux *http.ServeMux) {
	mux.HandleFunc("GET /window", s.handleWindowList)
	mux.HandleFunc("GET /window/new", s.handleWindowNew)
	mux.HandleFunc("POST /window", s.handleWindowOpen)
	mux.HandleFunc("GET /window/{id}", s.handleWindowDetail)
	mux.HandleFunc("POST /window/{id}/activate", s.handleWindowActivate)
	mux.HandleFunc("POST /window/{id}/revoke", s.handleWindowRevoke)
	mux.HandleFunc("POST /window/{id}/expire", s.handleWindowExpire)
}

// handleWindowList renders all Windows for a grantor holder (defaults to
// holder-alia if no query param, so the list view has something to show).
func (s *Server) handleWindowList(w http.ResponseWriter, r *http.Request) {
	grantor := r.URL.Query().Get("grantor")
	if grantor == "" {
		grantor = "holder-alia"
	}
	windows := s.Store.ListWindows(grantor)
	s.render(w, "window_list.html", map[string]any{"Windows": windows, "Grantor": grantor})
}

// handleWindowNew renders the "Open a Window" form.
func (s *Server) handleWindowNew(w http.ResponseWriter, r *http.Request) {
	s.render(w, "window_new.html", nil)
}

// handleWindowOpen handles the POST from the "Open a Window" form. Calls
// store.OpenWindow (creates a Window status=Open + an initial AuditEntry).
func (s *Server) handleWindowOpen(w http.ResponseWriter, r *http.Request) {
	grantor := r.FormValue("grantor_holder")
	grantee := r.FormValue("grantee")
	scopeKind := windowtypes.ScopeKind(r.FormValue("scope_kind"))
	resourceID := r.FormValue("resource_id")
	startStr := r.FormValue("start_unix")
	endStr := r.FormValue("end_unix")
	maxActionsStr := r.FormValue("max_actions")

	if grantor == "" {
		http.Error(w, "grantor holder is required", http.StatusBadRequest)
		return
	}
	if grantee == "" {
		http.Error(w, "grantee is required", http.StatusBadRequest)
		return
	}
	start, _ := strconv.ParseInt(startStr, 10, 64)
	end, _ := strconv.ParseInt(endStr, 10, 64)
	if start == 0 {
		start = time.Now().Unix()
	}
	if end == 0 {
		end = start + 3600
	}
	maxActions, _ := strconv.ParseUint(maxActionsStr, 10, 32)
	if maxActions == 0 {
		maxActions = 10
	}
	scope := windowtypes.Scope{Kind: scopeKind, ResourceID: resourceID}
	rateLimit := windowtypes.RateLimit{MaxActions: uint32(maxActions), PerDurationSeconds: 3600}
	win, err := s.Store.OpenWindow(grantor, grantee, scope, start, end, rateLimit)
	if err != nil {
		http.Error(w, "could not open a Window: "+err.Error(), http.StatusBadRequest)
		return
	}
	http.Redirect(w, r, "/window/"+win.WindowID, http.StatusFound)
}

// handleWindowDetail renders one Window + its lifecycle state + audit log.
func (s *Server) handleWindowDetail(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	win, ok := s.Store.GetWindow(id)
	if !ok {
		http.NotFound(w, r)
		return
	}
	auditLog := s.Store.GetAuditLog(id)
	s.render(w, "window_detail.html", map[string]any{"Window": win, "AuditLog": auditLog})
}

// handleWindowActivate transitions Open → Active (calls Window.Activate).
func (s *Server) handleWindowActivate(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if err := s.Store.ActivateWindow(id); err != nil {
		http.Error(w, "could not activate: "+err.Error(), http.StatusBadRequest)
		return
	}
	http.Redirect(w, r, "/window/"+id, http.StatusSeeOther)
}

// handleWindowRevoke transitions to Revoked (calls Window.Revoke; idempotent).
func (s *Server) handleWindowRevoke(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if err := s.Store.RevokeWindow(id); err != nil {
		http.Error(w, "could not revoke: "+err.Error(), http.StatusBadRequest)
		return
	}
	http.Redirect(w, r, "/window/"+id, http.StatusSeeOther)
}

// handleWindowExpire transitions to Expired (calls Window.Expire).
func (s *Server) handleWindowExpire(w http.ResponseWriter, r *http.Request) {
	id := r.PathValue("id")
	if err := s.Store.ExpireWindow(id); err != nil {
		http.Error(w, "could not expire: "+err.Error(), http.StatusBadRequest)
		return
	}
	http.Redirect(w, r, "/window/"+id, http.StatusSeeOther)
}